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若4x的平方+kx+25=(2x-5)的平方,那么k=要求讲解 3、已知（2x- = 4X平方+kx+9 则k的值为（ ）A、-6 B、 C、-12 D、 (2x+3)的平方=4x+kx+9 求k值是多少 Does tom do morning exercises every day?exercise后面为何加s?如题,呵呵.我胡乱猜.好像全文种表示复数的只有 “每天”.如果是这里关系,下面这句,没有s啊.Do you walk after supper every day? 已知三角形abc三个内角满足关系式3∠A=5∠B3∠C=2∠B则这个三角形是什么三角形我 要 过 程 谢 谢 1.4x*(x平方-1/2x-1)2a(a-4b)-b(a+2b) 3.(x+2)(x-4)-x(1-2x)4.6x(x+1)-(2x+3)(3x-1) What dose Smith ask Green to do?整个句子的意思 What does Ben ask Amy to do?怎么翻译帮帮我坐下 what does their teacher ask them to do? what does clenda smith do?的汉语意思? what is 中文意思是甚么?what does 中文意思是甚么?1)what is 中文意思是甚么?2)what does 中文意思是甚么? What does your father do?的中文意思是什么啊? what can Cindy does?单句改错 有什么好听的成语 什么动听成语 never_________his homework ,but he does well in all subjects.A did tom do B tom does C does tom doD tom has done Students like Tom_____（do）well in Chinese.填does还是do? 若3x²-x-1+0,求6x三次幂+7x²-5x+2001的值要有过程,急,谢谢 Tina is a little w--- in science,but she is good at Chinese and English. Tina is good at speaking Chinese.（改为同义句） What does Mr.Green do? is she good at chinese?同义句是什么 She isn't good at Chinese.的同义句：She ＿ ＿ ＿ in Chinese. Is she good at chinese?改成同意句 Does she [ ]chinese?括号里填什么? 4题 任意一个数列a（n加1）减a（n减1）能算吗 在△ABC中,若(sinA+sinC)(sinA-sinC)=sinB(sinA-sinB),则C= 已知x^2+y^2=1,对于任何x,y属于任何实数.恒有x+y-k>=0成立,则k的最大值为多少? 数列：已知数列[An]前n项和为Sn a1=1 An+1=2Sn 求【An] 求【n-An]前n项和Sn数列：已知数列[an]前n项和为Sn,a1=1 ,a[n+1]=2Sn,求[an]通项，求[n-an]前n项和Sn.注：a[n+1]指a 的下标为n+1而不是以n为下标的a加上1. an=1+2+3+..+n数列an分之1的前n项和为 托福报名怎么选日期和考位?我已经在NEEA付过费了,可是只有考位查询,没有预定考位,怎么回事呀?查询考位里面5月份还有位子啊,就是没有预定之类的选项 谁会托福改分